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bug#41982: [PATCH 0/1] gnu: grub: Cross-build fix for system i686-linux.
From: |
Jan Nieuwenhuizen |
Subject: |
bug#41982: [PATCH 0/1] gnu: grub: Cross-build fix for system i686-linux. |
Date: |
Tue, 23 Jun 2020 14:52:46 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) |
Ludovic Courtès writes:
Hello,
> Jan Nieuwenhuizen <janneke@gnu.org> skribis:
>
>> Attempting to reconfigure a i686-linux guix system to a Hurd system, I
>> found that the Grub(-minimal) cross build fails like this
>>
>> i586-pc-gnu-gcc -DHAVE_CONFIG_H -I. -I.. -Wall -W
>> -DGRUB_MACHINE_PCBIOS=1 -DGRUB_MACHINE=I386_PC -m32 -nostdinc
>> -isystem
>> /gnu/store/5s0ldm31100d9ix15d1lmbsvi0aa77pq-gcc-cross-i586-pc-gnu-7.5.0-lib/lib/gcc/i586-pc-gnu/7.5.0/include
>> -I../include -I../include -DGRUB_FILE=\"lib/cmos_datetime.c\"
[..]
>> lib/.deps-core/datetime_module-cmos_datetime.Tpo -c -o
>> lib/datetime_module-cmos_datetime.o `test -f 'lib/cmos_datetime.c'
>> || echo './'`lib/cmos_datetime.c
>> lib/i386/relocator64.S: Assembler messages:
>> lib/i386/relocator64.S:66: Error: unknown pseudo-op: `.code64'
>> lib/i386/relocator64.S:74: Error: bad register name `%rax'
>> lib/i386/relocator64.S:98: Error: bad register name `%rax'
>> lib/i386/relocator64.S:132: Error: bad register name `%rip)'
>
> Interesting. Why doesn’t it happen when doing:
>
> guix build grub-minimal -s i686-linux
>
> ? That’s because ‘as’ supports ‘.code64’ there?
Ah, that could be a switch! I imagined ".code64" was not supported,
"just like" using 64-bit registers.
>> I am not sure if and how to report this upstream. Ideas for a bug
>> description? Apparently, non-cross builds "just" work (how?!).
>
> The issue seems to be that ‘.code64’ is not supported by cross
> assemblers to 32-bit Intel, right?
That could be part of the problem, I don't know. I tested ‘.code64’ on
a 32-bit machine and get
--8<---------------cut here---------------start------------->8---
gcc -c foo-64.S
foo-64.S: Assembler messages:
foo-64.S:23: Error: unknown pseudo-op: `.code64'
foo-64.S:24: Error: bad register name `%rax'
foo-64.S:48: Error: unknown pseudo-op: `.code64'
foo-64.S:49: Error: bad register name `%rip)'
--8<---------------cut here---------------end--------------->8---
so, I'm not sure what's the idea here.
> Is this a defect of cross-as in general, or a misconfiguration in our
> Guix package? Or is this normal behavior that should be fixed in GRUB?
Good question. I will send the patch upstream (to Grub), maybe they can
share some light on this?
> Anyway, the patch LGTM!
Pushed to master as cd6b0910dc471afb76677109625af0a42ce3056a
Thanks!
Janneke
--
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond http://lilypond.org
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